/Engine/Source/Runtime/Datasmith/CADKernel/Public/CADKernel/Core/Database.h
All Entities are saved in the session map that allows to retrieve them according to their Id This process is automatically done during the entity creation (FEntity::MakeShared)
void AddEntity ( [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FEntity](API\Runtime\CADKernel\CADKernel\Core\FEntity) > Entity )